摘要
建立了考虑井壁弹性及钻柱接头影响的侧钻水平井钻柱摩阻力模型 ,给出了受弹性井壁约束钻柱的三弯矩方程及其数值解法 ;数值计算表明钻压、井身曲率、地基弹性、钻柱刚度、长度、钻柱与井壁间摩擦系数等因素都影响摩阻力的大小及分布 ,对于侧钻水平井而言 ,井身曲率的影响更为显著 ;该方法可适用中短半径水平井的摩阻力分析 ,供实际钻井作业参考。
Frictional force is the dominant factor that influences drilling operation and limits the further reach of horizontal section. This paper presents a new model for predicting frictional force of drill string in sidetracked horizontal well, with the wellbore elasticity and the effect of pipe joints taken into consideration. The three-moment equation for drill string constrained by elastic wellbore, as well as the numerical solving method is also created. The results show that such factors as WOB, hole curvature, ground elasticity, drill string stiffness and length, and friction coefficient between drill string and wellbore can all affect the magnitude and distribution of friction force, in which hole curvature is a most distinctive factor for sidetracked horizontal well. This method could be used for frictional force analysis in short to medium radius horizontal wells, and as a reference to field drilling practice.
出处
《石油钻采工艺》
CAS
CSCD
北大核心
2000年第1期27-31,共5页
Oil Drilling & Production Technology
关键词
侧钻
水平井
钻柱
摩阻力
钻井
sidetracking horizontal well frictional force mathematical model elasticity borehole drill pipe joint analysis
